Student exploration average atomic mass generator#

2) Compression stroke - fuel vapor and air are compressed and ignited. 1) Intake stroke - air and vaporised fuel are drawn in. Internal combustion engineĪ four-stroke internal combustion engine.

2, 1922, all telephone service in the United States and Canada was stopped for one minute to honor him. The invention quickly took off and revolutionized global business and communication. His father taught speech elocution and specialized in teaching the deaf speak, his mother, an accomplished musician, lost her hearing in later life and his wife Mabel, who he married in 1877, had been deaf since the age of five, according to Evenson. Edward Evenson in his book, “ The Telephone Patent Conspiracy of 1876: The Elisha Gray-Alexander Bell Controversy and Its Many Players” (McFarland, 2015).īell’s inspiration for the telephone was influenced by his family. Three days later, Bell made the first telephone call to his assistant, Thomas Watson, saying 'Mr Watson, come here - I want to see you,' according to author A. Several inventors did pioneering work on electronic voice transmission - many of whom later filed intellectual property lawsuits when telephone use exploded - but it was Scottish inventor Alexander Graham Bell who was the first to be awarded a patent for the electric telephone on March 7, 1876 (his patent drawing is pictured above).

Bell's telephone was the first apparatus to transmit human speech via machine. TelephoneĪlexander Graham Bell's Telephone patent drawing, from 1876. Instead of going to bed at nightfall (having nothing else to do) and sleeping in segments throughout the night separated by periods of wakefulness, we now stay up except for the 7 to 8 hours allotted for sleep, and, ideally, we sleep all in one go.

Student exploration average atomic mass generator#

Several inventors were instrumental in developing this revolutionary technology throughout the 1800s Thomas Edison is credited as the primary inventor because he created a completely functional lighting system, including a generator and wiring as well as a carbon-filament bulb like the one above, in 1879.Īs well as initiating the introduction of electricity in homes throughout the Western world, this invention also had a rather unexpected consequence of changing people's sleep patterns. The invention of the light bulb transformed our world by removing our dependence on natural light, allowing us to be productive at any time, day or night. (Image credit: Terren | Creative Commons) CompassĪn original Edison light bulb from 1879 from Thomas Edison's shop in Menlo Park, New Jersey. Even so, most of those people go on to be able to tolerate the drug, researchers said. This poster attached to a curbside mailbox advised World War II servicemen to take the drug to rid themselves of venereal disease.Ībout 1 in 10 people have an allergic reaction to the antibiotic, according to a study published in 2003 in the journal Clinical Reviews in Allergy and Immunology. Penicillin was being mass-produced and advertised by 1944. That antibiotic mold turned out to be the fungus Penicillium, and over the next two decades, chemists purified it and developed the drug penicillin, which fights a huge number of bacterial infections in humans without harming the humans themselves.

The sample had become contaminated with a mold, and everywhere the mold was, the bacteria was dead. In 1928, the Scottish scientist Alexander Fleming noticed a bacteria-filled Petri dish in his laboratory with its lid accidentally ajar. It's one of the most famous discovery stories in history. Alexander Fleming pictured in his laboratory (Image credit: Bettmann / Contributor)